casting & forming through hot isostatic press [hip]

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Introduction Isostatic Press

Cold Isostatic Press (CIP)

Hot Isostatic Press (HIP)

Advantages & applications.

Process considerations & parameters.

Effect of Mechanical properties on cast products on HIP

o On alloy IN738, Titanium , Aluminium alloys, Stainless steels

Case studies on various materials & tools showing possible improvements

in their mechanical property & work ability.

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Isostatic pressing applies a uniform, equal force over the entire product, regardless of shape or size.

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Cold isostatic pressing (CIP) Warm isostatic pressing (WIP) Hot isostatic pressing (HIP)

Isostatic pressing is generally used to produce large PM parts to near-net shapes of varied complexity.

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compaction pressure provides;• Density by there by porosity.• Localized deformation allowing new contacts

to be formed between particles

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• Temperature: 200°C–425°C to remove adsorbed moisture

• HIP process is rather slow, and a cycle may take 10 to 15 h,depends on part size, material, and furnace design.

Advantages:

Uniform strength in all directions

Uniform density Shape flexibility Component size

Larger parts Enhance alloying possibilities

Reduced lead times Material and machining costs

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CIP PM:

High green strength Difficult to press materials

HIP PM:

Improved mechanical properties

Isotropic Properties Predictability

Wear/corrosion resistance

Diffusion bonding Reduction in welds

Expensive Material Reduction

HOT Isostatic Pressing of casting:

Predictability Mechanical properties

Improved surface finish

Extended service life

Opens new markets Salvage Quality cost Manufacturing costs

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Material considerations for avoiding such harmful effects as• Initial melting• Grain growth• Degradation of constituent phases such as carbides

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Additional process considerations:• Gas Purity• Distortion of castings• Surface defect• Casting Salvage• Post-HIP Heat Treatment

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For alloy IN738

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For alloy IN738

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For alloy IN738

Stress rupture properties of IN738 hot isostatically pressed at 1205 C and 103 MPa for 4 hours.

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For Titanium

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For Titanium

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For Aluminium alloys- A356

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For Aluminium alloys- A356

HIP conditions: 520 °C and 103 MPa for 2 hours. Stress-controlled test on axially loaded specimen; maximum stress ratio R=0.1, frequency = 60 Hz, theoretical stress concentration factor Kt=1.0.

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For Stainless Steel

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Al-7Si-Mg alloy castings were subjected to a HIPing treatment of 100 MPa at 500 C for 6 hours

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Thus, HIPed material are safe and holds necessary superior mechanical properties for most of the small, moderate & bulk applications with high factor of safety.

HIPed cast or formed materials possess superior strength & toughness hence it is the widely scoped metallurgical casting process with aid of high pressure & temperature.

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